Installing induction hob+electric oven...separate circuits or same?

[les24preludes]

New kitchen - induction hob at 7.4kW (32amp) and oven at 3.6kW (16amp) max ratings. Existing outlets are:
1. 45amp fused cooker circuit
2. fused socket off ring main (32A fuse)

Can both oven and hob be connected off the one 45amp cooker circuit? That's right up to the maximum.

Or can the oven be connected to the ring main?

Or does the oven require its own circuit - that would be an extra installation and need rewiring to the fuse box.

 

[Midwest]

After all that kerfuffle, I still think the best advice is get an electrician in Les, before you have an accident

 

[les24preludes]

Just took a break to get other parts of the refit together.

Coming back to this, I think the answer is to use the existing 6mm "cooker" feed for the hob, and get an electrician to fit another 6mm feed from the fusebox for the oven, with its own fuse. That covers all the safety needs, and leaves a little extra capacity.

 

[kropaske]

Just took a break to get other parts of the refit together.

Coming back to this, I think the answer is to use the existing 6mm "cooker" feed for the hob, and get an electrician to fit another 6mm feed from the fusebox for the oven, with its own fuse. That covers all the safety needs, and leaves a little extra capacity.

Check the oven manual as well as often manufacturers require max 16/20amp PD for those ovens. So you may well comply with regs but not with manufacturer guidelines...

 

[Midwest]

Check the oven manual as well as often manufacturers require max 16/20amp PD for those ovens. So you may well comply with regs but not with manufacturer guidelines...

I might be wrong, but I thought ocpd were for the benefit of the cable they are supplying, not any appliance that's connected to it. Manufacturers instructions should now only be taken into consideration.

 

[kropaske]

I might be wrong, but I thought ocpd were for the benefit of the cable they are supplying, not any appliance that's connected to it. Manufacturers instructions should now only be taken into consideration.

Correct
But if they ask for one I would certainly fit one.

 

[Andy78]

Correct
But if they ask for one I would certainly fit one.

Even if it was completely unnecessary ?

 

[Midwest]

I'm not sure how providing a reduced ocpd for an oven for example might work, with all the different devices fitted internally, having different loads etc, to provide overload protection for the appliance. Have to say I've never seen this, only other than the manufacturer stating the minimum supply required?

 

[Andy78]

I'm not sure how providing a reduced ocpd for an oven for example might work, with all the different devices fitted internally, having different loads etc, to provide overload protection for the appliance. Have to say I've never seen this, only other than the manufacturer stating the minimum supply required?

The only reason I can think of would be to protect a flex supplied already connected to the appliance.

 

[Midwest]

Although an oven doesn't have a fixed load, one assumes the manufacturer would install a supply cable suitable for it's maximum load?

 

[Andy78]

Although an oven doesn't have a fixed load, one assumes the manufacturer would install a supply cable suitable for it's maximum load?

I have seen pre wired flexes with a CCC smaller than the total connected loads. I assume the manufacturer based the cable size on the diversity due to the cycling of the loads built in to the appliance.

 

[Midwest]

Yes agree, but with most ovens for example, you cannot have the main oven selected with the side, top or bottom element. And vise versa. So a suitable cable would be supplied for the maximum possible culmination of load. Same cannot be said of electric hobs, but I haven't seen any hobs with a manufacturers cable?

 

[Andy78]

Yeah it was a hob I was on about.

 

[Taylortwocities]

I haven't seen any hobs with a manufacturers cable?

I have a NEFF hob, that came fitted with a cable. It was a 5-core cable that can be configured to meet single/multi phase supplies..

Others i have fitted did need a cable to be supplied and fitted.

 

[kropaske]

I have a NEFF hob, that came fitted with a cable. It was a 5-core cable that can be configured to meet single/multi phase supplies..

Others i have fitted did need a cable to be supplied and fitted.

Like this one...

 

[Midwest]

Well there you go. Out of curiosity did it ask for derating ocpd?

 

[kropaske]

Well there you go. Out of curiosity did it ask for derating ocpd?

That's hob not oven.
I came across some from aeg and electrolux that ask for min 16 and max 20amp fuse.
It may be to stop people wire them in to the kitchen rings through 20amp isolator.

I went once to check one. Turn out it was 3.6kw oven and was connected with 13 amp plug to the socket. It last almost a 1 year before fuse went and burn socket slightly. Customer got new oven and this one looks really nice in my kitchen now...